the lawmaker whose name is on this letter, senator roger wicker, republican from mississippi, says this matter is an ongoing investigation by the f.b.i. i want to thank law officials for their hard work and diligence in keeping those of us who work in the capitol complex safe. as for the u.s. postal service, they say their primary concern is keeping their employees safe, their customers safe and keeping the u.s. mail safe as well. >>gretchen: let's do some other headlines. a thrift store worker hospitalized after an explosion in his face. the georgia man suffered minor burns and immediately people started thinking of the boston attack. >> given yesterday's event, we're going to be extra cautious. that's why you see the response you're seeing here today. >>gretchen: however officials do say that incident was isolated. >>brian: american airlines says they'll be back to near normal operations today. a major computer meltdown forced the airline to cancel nearly 1,000 flights and delay over 1,000 more. american says their reservation system was down for hours. thousands of passengers were le